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Sorry chaps. The speed of your replies took me by surprise! Thanks for the advice Tony. The f and e tank is alrady full. Would it work putting a hose into the cold feed and waiting to see it pushed out of the vent pipe? Just thinking about the logistics of getting water into the vent pipe...

No, the main flow and return is 22mm from the boiler reducing to 15mm to the radiators. I feel sure you're right about air in the system. Any bright ideas? Thanks.

Hi. Tonight I've drained the f and e tank in the loft enough to add some corosion inhibitor to the system and change a dripping ball valve. I filled the f and e tank again and bled the radiators. Downstairs rads had virtually no air in them, however, upstairs took absolutely ages to bleed. On...